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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47126aa00a8e8d7a78529581d6e291285222d5db836724cef8fd9b09c76a8210' 
  AND token = 'j6qXebOUduVeVyCg7zFwBW3/Rzj9VX9DBjG8EH2rMRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}